Abstract

Neoclassical theory with the impurity rotational velocity is used to evaluate the radial electric field, in a tokamak. The result of using the complete matrix method for the deuterium–carbon plasma is compared with a reduced analytic formula for determining [Ernst et al., Phys. Plasmas 5, 665 (1998)]. The analytic formula is shown to overestimate the magnitude and its gradient. Two transport measures of the effect of the shear are compared for the reversed shear and enhanced reversed shear discharges in TokamakFusion Test Reactor [Mazzucato et al., Phys. Rev. Lett. 77, 3145 (1996)]. It is shown that the combined and magnetic shear measure, from linear stability theory gives a higher correlation with the observed transition between the two discharges than the vorticity measure from shear alone.